ash/shell.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ash/shell.h"
   6
   7 #include <algorithm>
   8 #include <string>
   9
  10 #include "ash/accelerators/accelerator_controller.h"
  11 #include "ash/accelerators/accelerator_filter.h"
  12 #include "ash/accelerators/focus_manager_factory.h"
  13 #include "ash/accelerators/nested_dispatcher_controller.h"
  14 #include "ash/accelerometer/accelerometer_controller.h"
  15 #include "ash/ash_switches.h"
  16 #include "ash/autoclick/autoclick_controller.h"
  17 #include "ash/desktop_background/desktop_background_controller.h"
  18 #include "ash/desktop_background/desktop_background_view.h"
  19 #include "ash/desktop_background/user_wallpaper_delegate.h"
  20 #include "ash/display/cursor_window_controller.h"
  21 #include "ash/display/display_controller.h"
  22 #include "ash/display/display_manager.h"
  23 #include "ash/display/event_transformation_handler.h"
  24 #include "ash/display/mouse_cursor_event_filter.h"
  25 #include "ash/display/screen_position_controller.h"
  26 #include "ash/display/virtual_keyboard_window_controller.h"
  27 #include "ash/drag_drop/drag_drop_controller.h"
  28 #include "ash/first_run/first_run_helper_impl.h"
  29 #include "ash/focus_cycler.h"
  30 #include "ash/frame/custom_frame_view_ash.h"
  31 #include "ash/gpu_support.h"
  32 #include "ash/high_contrast/high_contrast_controller.h"
  33 #include "ash/keyboard_uma_event_filter.h"
  34 #include "ash/magnifier/magnification_controller.h"
  35 #include "ash/magnifier/partial_magnification_controller.h"
  36 #include "ash/media_delegate.h"
  37 #include "ash/new_window_delegate.h"
  38 #include "ash/root_window_controller.h"
  39 #include "ash/session_state_delegate.h"
  40 #include "ash/shelf/app_list_shelf_item_delegate.h"
  41 #include "ash/shelf/shelf_delegate.h"
  42 #include "ash/shelf/shelf_item_delegate.h"
  43 #include "ash/shelf/shelf_item_delegate_manager.h"
  44 #include "ash/shelf/shelf_layout_manager.h"
  45 #include "ash/shelf/shelf_model.h"
  46 #include "ash/shelf/shelf_widget.h"
  47 #include "ash/shelf/shelf_window_watcher.h"
  48 #include "ash/shell_delegate.h"
  49 #include "ash/shell_factory.h"
  50 #include "ash/shell_window_ids.h"
  51 #include "ash/system/locale/locale_notification_controller.h"
  52 #include "ash/system/status_area_widget.h"
  53 #include "ash/system/tray/system_tray_delegate.h"
  54 #include "ash/system/tray/system_tray_notifier.h"
  55 #include "ash/wm/app_list_controller.h"
  56 #include "ash/wm/ash_focus_rules.h"
  57 #include "ash/wm/ash_native_cursor_manager.h"
  58 #include "ash/wm/coordinate_conversion.h"
  59 #include "ash/wm/event_client_impl.h"
  60 #include "ash/wm/lock_state_controller.h"
  61 #include "ash/wm/maximize_mode/maximize_mode_controller.h"
  62 #include "ash/wm/maximize_mode/maximize_mode_window_manager.h"
  63 #include "ash/wm/mru_window_tracker.h"
  64 #include "ash/wm/overlay_event_filter.h"
  65 #include "ash/wm/overview/window_selector_controller.h"
  66 #include "ash/wm/power_button_controller.h"
  67 #include "ash/wm/resize_shadow_controller.h"
  68 #include "ash/wm/root_window_layout_manager.h"
  69 #include "ash/wm/screen_dimmer.h"
  70 #include "ash/wm/system_gesture_event_filter.h"
  71 #include "ash/wm/system_modal_container_event_filter.h"
  72 #include "ash/wm/system_modal_container_layout_manager.h"
  73 #include "ash/wm/toplevel_window_event_handler.h"
  74 #include "ash/wm/video_detector.h"
  75 #include "ash/wm/window_animations.h"
  76 #include "ash/wm/window_positioner.h"
  77 #include "ash/wm/window_properties.h"
  78 #include "ash/wm/window_util.h"
  79 #include "ash/wm/workspace_controller.h"
  80 #include "base/bind.h"
  81 #include "base/debug/trace_event.h"
  82 #include "ui/aura/client/aura_constants.h"
  83 #include "ui/aura/env.h"
  84 #include "ui/aura/layout_manager.h"
  85 #include "ui/aura/window.h"
  86 #include "ui/aura/window_event_dispatcher.h"
  87 #include "ui/base/ui_base_switches.h"
  88 #include "ui/compositor/layer.h"
  89 #include "ui/compositor/layer_animator.h"
  90 #include "ui/events/event_target_iterator.h"
  91 #include "ui/gfx/display.h"
  92 #include "ui/gfx/image/image_skia.h"
  93 #include "ui/gfx/screen.h"
  94 #include "ui/gfx/size.h"
  95 #include "ui/keyboard/keyboard.h"
  96 #include "ui/keyboard/keyboard_controller.h"
  97 #include "ui/keyboard/keyboard_switches.h"
  98 #include "ui/keyboard/keyboard_util.h"
  99 #include "ui/message_center/message_center.h"
 100 #include "ui/views/corewm/tooltip_aura.h"
 101 #include "ui/views/corewm/tooltip_controller.h"
 102 #include "ui/views/focus/focus_manager_factory.h"
 103 #include "ui/views/widget/native_widget_aura.h"
 104 #include "ui/views/widget/widget.h"
 105 #include "ui/wm/core/compound_event_filter.h"
 106 #include "ui/wm/core/focus_controller.h"
 107 #include "ui/wm/core/input_method_event_filter.h"
 108 #include "ui/wm/core/shadow_controller.h"
 109 #include "ui/wm/core/user_activity_detector.h"
 110 #include "ui/wm/core/visibility_controller.h"
 111 #include "ui/wm/core/window_modality_controller.h"
 112
 113 #if defined(OS_CHROMEOS)
 114 #if defined(USE_X11)
 115 #include "ash/accelerators/magnifier_key_scroller.h"
 116 #include "ash/accelerators/spoken_feedback_toggler.h"
 117 #include "ui/gfx/x/x11_types.h"
 118 #endif  // defined(USE_X11)
 119 #include "ash/ash_constants.h"
 120 #include "ash/display/display_change_observer_chromeos.h"
 121 #include "ash/display/display_error_observer_chromeos.h"
 122 #include "ash/display/output_configurator_animation.h"
 123 #include "ash/display/projecting_observer_chromeos.h"
 124 #include "ash/display/resolution_notification_controller.h"
 125 #include "ash/sticky_keys/sticky_keys_controller.h"
 126 #include "ash/system/chromeos/bluetooth/bluetooth_notification_controller.h"
 127 #include "ash/system/chromeos/brightness/brightness_controller_chromeos.h"
 128 #include "ash/system/chromeos/power/power_event_observer.h"
 129 #include "ash/system/chromeos/power/power_status.h"
 130 #include "ash/system/chromeos/power/video_activity_notifier.h"
 131 #include "ash/system/chromeos/session/last_window_closed_logout_reminder.h"
 132 #include "ash/system/chromeos/session/logout_confirmation_controller.h"
 133 #include "base/bind_helpers.h"
 134 #include "base/sys_info.h"
 135 #include "ui/chromeos/user_activity_power_manager_notifier.h"
 136 #include "ui/display/chromeos/display_configurator.h"
 137 #endif  // defined(OS_CHROMEOS)
 138
 139 namespace ash {
 140
 141 namespace {
 142
 143 using aura::Window;
 144 using views::Widget;
 145
 146 // A Corewm VisibilityController subclass that calls the Ash animation routine
 147 // so we can pick up our extended animations. See ash/wm/window_animations.h.
 148 class AshVisibilityController : public ::wm::VisibilityController {
 149  public:
 150   AshVisibilityController() {}
 151   virtual ~AshVisibilityController() {}
 152
 153  private:
 154   // Overridden from ::wm::VisibilityController:
 155   virtual bool CallAnimateOnChildWindowVisibilityChanged(
 156       aura::Window* window,
 157       bool visible) OVERRIDE {
 158     return AnimateOnChildWindowVisibilityChanged(window, visible);
 159   }
 160
 161   DISALLOW_COPY_AND_ASSIGN(AshVisibilityController);
 162 };
 163
 164 }  // namespace
 165
 166 // static
 167 Shell* Shell::instance_ = NULL;
 168 // static
 169 bool Shell::initially_hide_cursor_ = false;
 170
 171 ////////////////////////////////////////////////////////////////////////////////
 172 // Shell, public:
 173
 174 // static
 175 Shell* Shell::CreateInstance(ShellDelegate* delegate) {
 176   CHECK(!instance_);
 177   instance_ = new Shell(delegate);
 178   instance_->Init();
 179   return instance_;
 180 }
 181
 182 // static
 183 Shell* Shell::GetInstance() {
 184   DCHECK(instance_);
 185   return instance_;
 186 }
 187
 188 // static
 189 bool Shell::HasInstance() {
 190   return !!instance_;
 191 }
 192
 193 // static
 194 void Shell::DeleteInstance() {
 195   delete instance_;
 196   instance_ = NULL;
 197 }
 198
 199 // static
 200 RootWindowController* Shell::GetPrimaryRootWindowController() {
 201   return GetRootWindowController(GetPrimaryRootWindow());
 202 }
 203
 204 // static
 205 Shell::RootWindowControllerList Shell::GetAllRootWindowControllers() {
 206   return Shell::GetInstance()->display_controller()->
 207       GetAllRootWindowControllers();
 208 }
 209
 210 // static
 211 aura::Window* Shell::GetPrimaryRootWindow() {
 212   return GetInstance()->display_controller()->GetPrimaryRootWindow();
 213 }
 214
 215 // static
 216 aura::Window* Shell::GetTargetRootWindow() {
 217   Shell* shell = GetInstance();
 218   if (shell->scoped_target_root_window_)
 219     return shell->scoped_target_root_window_;
 220   return shell->target_root_window_;
 221 }
 222
 223 // static
 224 gfx::Screen* Shell::GetScreen() {
 225   return gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_ALTERNATE);
 226 }
 227
 228 // static
 229 aura::Window::Windows Shell::GetAllRootWindows() {
 230   return Shell::GetInstance()->display_controller()->
 231       GetAllRootWindows();
 232 }
 233
 234 // static
 235 aura::Window* Shell::GetContainer(aura::Window* root_window,
 236                                   int container_id) {
 237   return root_window->GetChildById(container_id);
 238 }
 239
 240 // static
 241 const aura::Window* Shell::GetContainer(const aura::Window* root_window,
 242                                         int container_id) {
 243   return root_window->GetChildById(container_id);
 244 }
 245
 246 // static
 247 std::vector<aura::Window*> Shell::GetContainersFromAllRootWindows(
 248     int container_id,
 249     aura::Window* priority_root) {
 250   std::vector<aura::Window*> containers;
 251   aura::Window::Windows root_windows = GetAllRootWindows();
 252   for (aura::Window::Windows::const_iterator it = root_windows.begin();
 253        it != root_windows.end(); ++it) {
 254     aura::Window* container = (*it)->GetChildById(container_id);
 255     if (container) {
 256       if (priority_root && priority_root->Contains(container))
 257         containers.insert(containers.begin(), container);
 258       else
 259         containers.push_back(container);
 260     }
 261   }
 262   return containers;
 263 }
 264
 265 void Shell::ShowContextMenu(const gfx::Point& location_in_screen,
 266                             ui::MenuSourceType source_type) {
 267   // No context menus if there is no session with an active user.
 268   if (!session_state_delegate_->NumberOfLoggedInUsers())
 269     return;
 270   // No context menus when screen is locked.
 271   if (session_state_delegate_->IsScreenLocked())
 272     return;
 273
 274   aura::Window* root =
 275       wm::GetRootWindowMatching(gfx::Rect(location_in_screen, gfx::Size()));
 276   GetRootWindowController(root)
 277       ->ShowContextMenu(location_in_screen, source_type);
 278 }
 279
 280 void Shell::ToggleAppList(aura::Window* window) {
 281   // If the context window is not given, show it on the target root window.
 282   if (!window)
 283     window = GetTargetRootWindow();
 284   if (!app_list_controller_)
 285     app_list_controller_.reset(new AppListController);
 286   app_list_controller_->SetVisible(!app_list_controller_->IsVisible(), window);
 287 }
 288
 289 bool Shell::GetAppListTargetVisibility() const {
 290   return app_list_controller_.get() &&
 291       app_list_controller_->GetTargetVisibility();
 292 }
 293
 294 aura::Window* Shell::GetAppListWindow() {
 295   return app_list_controller_.get() ? app_list_controller_->GetWindow() : NULL;
 296 }
 297
 298 app_list::AppListView* Shell::GetAppListView() {
 299   return app_list_controller_.get() ? app_list_controller_->GetView() : NULL;
 300 }
 301
 302 bool Shell::IsSystemModalWindowOpen() const {
 303   if (simulate_modal_window_open_for_testing_)
 304     return true;
 305   const std::vector<aura::Window*> containers = GetContainersFromAllRootWindows(
 306       kShellWindowId_SystemModalContainer, NULL);
 307   for (std::vector<aura::Window*>::const_iterator cit = containers.begin();
 308        cit != containers.end(); ++cit) {
 309     for (aura::Window::Windows::const_iterator wit = (*cit)->children().begin();
 310          wit != (*cit)->children().end(); ++wit) {
 311       if ((*wit)->GetProperty(aura::client::kModalKey) ==
 312           ui::MODAL_TYPE_SYSTEM && (*wit)->TargetVisibility()) {
 313         return true;
 314       }
 315     }
 316   }
 317   return false;
 318 }
 319
 320 views::NonClientFrameView* Shell::CreateDefaultNonClientFrameView(
 321     views::Widget* widget) {
 322   // Use translucent-style window frames for dialogs.
 323   return new CustomFrameViewAsh(widget);
 324 }
 325
 326 void Shell::RotateFocus(Direction direction) {
 327   focus_cycler_->RotateFocus(direction == FORWARD ? FocusCycler::FORWARD
 328                                                   : FocusCycler::BACKWARD);
 329 }
 330
 331 void Shell::SetDisplayWorkAreaInsets(Window* contains,
 332                                      const gfx::Insets& insets) {
 333   if (!display_controller_->UpdateWorkAreaOfDisplayNearestWindow(
 334           contains, insets)) {
 335     return;
 336   }
 337   FOR_EACH_OBSERVER(ShellObserver, observers_,
 338                     OnDisplayWorkAreaInsetsChanged());
 339 }
 340
 341 void Shell::OnLoginStateChanged(user::LoginStatus status) {
 342   FOR_EACH_OBSERVER(ShellObserver, observers_, OnLoginStateChanged(status));
 343 }
 344
 345 void Shell::OnLoginUserProfilePrepared() {
 346   CreateShelf();
 347   CreateKeyboard();
 348 }
 349
 350 void Shell::UpdateAfterLoginStatusChange(user::LoginStatus status) {
 351   RootWindowControllerList controllers = GetAllRootWindowControllers();
 352   for (RootWindowControllerList::iterator iter = controllers.begin();
 353        iter != controllers.end(); ++iter)
 354     (*iter)->UpdateAfterLoginStatusChange(status);
 355 }
 356
 357 void Shell::OnAppTerminating() {
 358   FOR_EACH_OBSERVER(ShellObserver, observers_, OnAppTerminating());
 359 }
 360
 361 void Shell::OnLockStateChanged(bool locked) {
 362   FOR_EACH_OBSERVER(ShellObserver, observers_, OnLockStateChanged(locked));
 363 #ifndef NDEBUG
 364   // Make sure that there is no system modal in Lock layer when unlocked.
 365   if (!locked) {
 366     std::vector<aura::Window*> containers = GetContainersFromAllRootWindows(
 367         kShellWindowId_LockSystemModalContainer, GetPrimaryRootWindow());
 368     for (std::vector<aura::Window*>::const_iterator iter = containers.begin();
 369          iter != containers.end(); ++iter) {
 370       DCHECK_EQ(0u, (*iter)->children().size());
 371     }
 372   }
 373 #endif
 374 }
 375
 376 void Shell::OnCastingSessionStartedOrStopped(bool started) {
 377 #if defined(OS_CHROMEOS) && defined(USE_X11)
 378   if (projecting_observer_)
 379     projecting_observer_->OnCastingSessionStartedOrStopped(started);
 380 #endif
 381 }
 382
 383 void Shell::OnOverviewModeStarting() {
 384   FOR_EACH_OBSERVER(ShellObserver, observers_, OnOverviewModeStarting());
 385 }
 386
 387 void Shell::OnOverviewModeEnding() {
 388   FOR_EACH_OBSERVER(ShellObserver, observers_, OnOverviewModeEnding());
 389 }
 390
 391 void Shell::OnMaximizeModeStarted() {
 392   FOR_EACH_OBSERVER(ShellObserver, observers_, OnMaximizeModeStarted());
 393 }
 394
 395 void Shell::OnMaximizeModeEnded() {
 396   FOR_EACH_OBSERVER(ShellObserver, observers_, OnMaximizeModeEnded());
 397 }
 398
 399 void Shell::OnRootWindowAdded(aura::Window* root_window) {
 400   FOR_EACH_OBSERVER(ShellObserver, observers_, OnRootWindowAdded(root_window));
 401 }
 402
 403 void Shell::CreateShelf() {
 404   RootWindowControllerList controllers = GetAllRootWindowControllers();
 405   for (RootWindowControllerList::iterator iter = controllers.begin();
 406        iter != controllers.end(); ++iter)
 407     (*iter)->shelf()->CreateShelf();
 408 }
 409
 410 void Shell::OnShelfCreatedForRootWindow(aura::Window* root_window) {
 411   FOR_EACH_OBSERVER(ShellObserver,
 412                     observers_,
 413                     OnShelfCreatedForRootWindow(root_window));
 414 }
 415
 416 void Shell::CreateKeyboard() {
 417   // TODO(bshe): Primary root window controller may not be the controller to
 418   // attach virtual keyboard. See http://crbug.com/303429
 419   InitKeyboard();
 420   if (keyboard::IsKeyboardUsabilityExperimentEnabled()) {
 421     display_controller()->virtual_keyboard_window_controller()->
 422         ActivateKeyboard(keyboard::KeyboardController::GetInstance());
 423   } else {
 424     GetPrimaryRootWindowController()->
 425         ActivateKeyboard(keyboard::KeyboardController::GetInstance());
 426   }
 427 }
 428
 429 void Shell::DeactivateKeyboard() {
 430   if (keyboard::KeyboardController::GetInstance()) {
 431     RootWindowControllerList controllers = GetAllRootWindowControllers();
 432     for (RootWindowControllerList::iterator iter = controllers.begin();
 433         iter != controllers.end(); ++iter) {
 434       (*iter)->DeactivateKeyboard(keyboard::KeyboardController::GetInstance());
 435     }
 436   }
 437   keyboard::KeyboardController::ResetInstance(NULL);
 438 }
 439
 440 void Shell::ShowShelf() {
 441   RootWindowControllerList controllers = GetAllRootWindowControllers();
 442   for (RootWindowControllerList::iterator iter = controllers.begin();
 443        iter != controllers.end(); ++iter)
 444     (*iter)->ShowShelf();
 445 }
 446
 447 void Shell::AddShellObserver(ShellObserver* observer) {
 448   observers_.AddObserver(observer);
 449 }
 450
 451 void Shell::RemoveShellObserver(ShellObserver* observer) {
 452   observers_.RemoveObserver(observer);
 453 }
 454
 455 void Shell::EnableMaximizeModeWindowManager(bool enable) {
 456   if (enable && !maximize_mode_window_manager_.get()) {
 457     maximize_mode_window_manager_.reset(new MaximizeModeWindowManager());
 458   } else if (!enable && maximize_mode_window_manager_.get()) {
 459     maximize_mode_window_manager_.reset();
 460   }
 461 }
 462
 463 bool Shell::IsMaximizeModeWindowManagerEnabled() {
 464   return maximize_mode_window_manager_.get() != NULL;
 465 }
 466
 467 void Shell::UpdateShelfVisibility() {
 468   RootWindowControllerList controllers = GetAllRootWindowControllers();
 469   for (RootWindowControllerList::iterator iter = controllers.begin();
 470        iter != controllers.end(); ++iter)
 471     if ((*iter)->shelf())
 472       (*iter)->UpdateShelfVisibility();
 473 }
 474
 475 void Shell::SetShelfAutoHideBehavior(ShelfAutoHideBehavior behavior,
 476                                      aura::Window* root_window) {
 477   ash::ShelfLayoutManager::ForShelf(root_window)->SetAutoHideBehavior(behavior);
 478 }
 479
 480 ShelfAutoHideBehavior Shell::GetShelfAutoHideBehavior(
 481     aura::Window* root_window) const {
 482   return ash::ShelfLayoutManager::ForShelf(root_window)->auto_hide_behavior();
 483 }
 484
 485 void Shell::SetShelfAlignment(ShelfAlignment alignment,
 486                               aura::Window* root_window) {
 487   if (ash::ShelfLayoutManager::ForShelf(root_window)->SetAlignment(alignment)) {
 488     FOR_EACH_OBSERVER(
 489         ShellObserver, observers_, OnShelfAlignmentChanged(root_window));
 490   }
 491 }
 492
 493 ShelfAlignment Shell::GetShelfAlignment(aura::Window* root_window) {
 494   return GetRootWindowController(root_window)
 495       ->GetShelfLayoutManager()
 496       ->GetAlignment();
 497 }
 498
 499 void Shell::SetDimming(bool should_dim) {
 500   RootWindowControllerList controllers = GetAllRootWindowControllers();
 501   for (RootWindowControllerList::iterator iter = controllers.begin();
 502        iter != controllers.end(); ++iter)
 503     (*iter)->screen_dimmer()->SetDimming(should_dim);
 504 }
 505
 506 void Shell::NotifyFullscreenStateChange(bool is_fullscreen,
 507                                         aura::Window* root_window) {
 508   FOR_EACH_OBSERVER(ShellObserver, observers_, OnFullscreenStateChanged(
 509       is_fullscreen, root_window));
 510 }
 511
 512 void Shell::CreateModalBackground(aura::Window* window) {
 513   if (!modality_filter_) {
 514     modality_filter_.reset(new SystemModalContainerEventFilter(this));
 515     AddPreTargetHandler(modality_filter_.get());
 516   }
 517   RootWindowControllerList controllers = GetAllRootWindowControllers();
 518   for (RootWindowControllerList::iterator iter = controllers.begin();
 519        iter != controllers.end(); ++iter)
 520     (*iter)->GetSystemModalLayoutManager(window)->CreateModalBackground();
 521 }
 522
 523 void Shell::OnModalWindowRemoved(aura::Window* removed) {
 524   RootWindowControllerList controllers = GetAllRootWindowControllers();
 525   bool activated = false;
 526   for (RootWindowControllerList::iterator iter = controllers.begin();
 527        iter != controllers.end() && !activated; ++iter) {
 528     activated = (*iter)->GetSystemModalLayoutManager(removed)->
 529         ActivateNextModalWindow();
 530   }
 531   if (!activated) {
 532     RemovePreTargetHandler(modality_filter_.get());
 533     modality_filter_.reset();
 534     for (RootWindowControllerList::iterator iter = controllers.begin();
 535          iter != controllers.end(); ++iter)
 536       (*iter)->GetSystemModalLayoutManager(removed)->DestroyModalBackground();
 537   }
 538 }
 539
 540 WebNotificationTray* Shell::GetWebNotificationTray() {
 541   return GetPrimaryRootWindowController()->shelf()->
 542       status_area_widget()->web_notification_tray();
 543 }
 544
 545 bool Shell::HasPrimaryStatusArea() {
 546   ShelfWidget* shelf = GetPrimaryRootWindowController()->shelf();
 547   return shelf && shelf->status_area_widget();
 548 }
 549
 550 SystemTray* Shell::GetPrimarySystemTray() {
 551   return GetPrimaryRootWindowController()->GetSystemTray();
 552 }
 553
 554 ShelfDelegate* Shell::GetShelfDelegate() {
 555   if (!shelf_delegate_) {
 556     shelf_model_.reset(new ShelfModel);
 557     // Creates ShelfItemDelegateManager before ShelfDelegate.
 558     shelf_item_delegate_manager_.reset(
 559         new ShelfItemDelegateManager(shelf_model_.get()));
 560
 561     shelf_delegate_.reset(delegate_->CreateShelfDelegate(shelf_model_.get()));
 562     scoped_ptr<ShelfItemDelegate> controller(new AppListShelfItemDelegate);
 563
 564     // Finding the shelf model's location of the app list and setting its
 565     // ShelfItemDelegate.
 566     int app_list_index = shelf_model_->GetItemIndexForType(TYPE_APP_LIST);
 567     DCHECK_GE(app_list_index, 0);
 568     ShelfID app_list_id = shelf_model_->items()[app_list_index].id;
 569     DCHECK(app_list_id);
 570     shelf_item_delegate_manager_->SetShelfItemDelegate(app_list_id,
 571                                                        controller.Pass());
 572     shelf_window_watcher_.reset(new ShelfWindowWatcher(
 573         shelf_model_.get(), shelf_item_delegate_manager_.get()));
 574   }
 575   return shelf_delegate_.get();
 576 }
 577
 578 void Shell::SetTouchHudProjectionEnabled(bool enabled) {
 579   if (is_touch_hud_projection_enabled_ == enabled)
 580     return;
 581
 582   is_touch_hud_projection_enabled_ = enabled;
 583   FOR_EACH_OBSERVER(ShellObserver, observers_,
 584                     OnTouchHudProjectionToggled(enabled));
 585 }
 586
 587 #if defined(OS_CHROMEOS)
 588 ash::FirstRunHelper* Shell::CreateFirstRunHelper() {
 589   return new ash::FirstRunHelperImpl;
 590 }
 591
 592 void Shell::SetCursorCompositingEnabled(bool enabled) {
 593   display_controller_->cursor_window_controller()->SetCursorCompositingEnabled(
 594       enabled);
 595   native_cursor_manager_->SetNativeCursorEnabled(!enabled);
 596 }
 597 #endif  // defined(OS_CHROMEOS)
 598
 599 void Shell::DoInitialWorkspaceAnimation() {
 600   return GetPrimaryRootWindowController()->workspace_controller()->
 601       DoInitialAnimation();
 602 }
 603
 604 ////////////////////////////////////////////////////////////////////////////////
 605 // Shell, private:
 606
 607 Shell::Shell(ShellDelegate* delegate)
 608     : target_root_window_(NULL),
 609       scoped_target_root_window_(NULL),
 610       delegate_(delegate),
 611       window_positioner_(new WindowPositioner),
 612       activation_client_(NULL),
 613       accelerometer_controller_(new AccelerometerController()),
 614 #if defined(OS_CHROMEOS)
 615       display_configurator_(new ui::DisplayConfigurator()),
 616 #endif  // defined(OS_CHROMEOS)
 617       native_cursor_manager_(new AshNativeCursorManager),
 618       cursor_manager_(
 619           scoped_ptr< ::wm::NativeCursorManager>(native_cursor_manager_)),
 620       simulate_modal_window_open_for_testing_(false),
 621       is_touch_hud_projection_enabled_(false) {
 622   DCHECK(delegate_.get());
 623   gpu_support_.reset(delegate_->CreateGPUSupport());
 624   display_manager_.reset(new DisplayManager);
 625   display_controller_.reset(new DisplayController);
 626 #if defined(OS_CHROMEOS) && defined(USE_X11)
 627   user_metrics_recorder_.reset(new UserMetricsRecorder);
 628 #endif  // defined(OS_CHROMEOS)
 629
 630 #if defined(OS_CHROMEOS)
 631   PowerStatus::Initialize();
 632 #endif
 633 }
 634
 635 Shell::~Shell() {
 636   TRACE_EVENT0("shutdown", "ash::Shell::Destructor");
 637
 638   delegate_->PreShutdown();
 639
 640   views::FocusManagerFactory::Install(NULL);
 641
 642   // Remove the focus from any window. This will prevent overhead and side
 643   // effects (e.g. crashes) from changing focus during shutdown.
 644   // See bug crbug.com/134502.
 645   aura::client::GetFocusClient(GetPrimaryRootWindow())->FocusWindow(NULL);
 646
 647   // Please keep in same order as in Init() because it's easy to miss one.
 648   if (window_modality_controller_)
 649     window_modality_controller_.reset();
 650 #if defined(OS_CHROMEOS) && defined(USE_X11)
 651   RemovePreTargetHandler(magnifier_key_scroll_handler_.get());
 652   magnifier_key_scroll_handler_.reset();
 653
 654   RemovePreTargetHandler(speech_feedback_handler_.get());
 655   speech_feedback_handler_.reset();
 656 #endif
 657   RemovePreTargetHandler(user_activity_detector_.get());
 658   RemovePreTargetHandler(overlay_filter_.get());
 659   RemovePreTargetHandler(input_method_filter_.get());
 660   RemovePreTargetHandler(accelerator_filter_.get());
 661   RemovePreTargetHandler(event_transformation_handler_.get());
 662   RemovePreTargetHandler(toplevel_window_event_handler_.get());
 663   RemovePostTargetHandler(toplevel_window_event_handler_.get());
 664   RemovePreTargetHandler(system_gesture_filter_.get());
 665   RemovePreTargetHandler(keyboard_metrics_filter_.get());
 666   if (mouse_cursor_filter_)
 667     RemovePreTargetHandler(mouse_cursor_filter_.get());
 668
 669   // TooltipController is deleted with the Shell so removing its references.
 670   RemovePreTargetHandler(tooltip_controller_.get());
 671
 672   // Destroy maximize window manager early on since it has some observers which
 673   // need to be removed.
 674   maximize_mode_controller_.reset();
 675   maximize_mode_window_manager_.reset();
 676
 677   // AppList needs to be released before shelf layout manager, which is
 678   // destroyed with shelf container in the loop below. However, app list
 679   // container is now on top of shelf container and released after it.
 680   // TODO(xiyuan): Move it back when app list container is no longer needed.
 681   app_list_controller_.reset();
 682
 683 #if defined(OS_CHROMEOS)
 684   // Destroy the LastWindowClosedLogoutReminder before the
 685   // LogoutConfirmationController.
 686   last_window_closed_logout_reminder_.reset();
 687
 688   // Destroy the LogoutConfirmationController before the SystemTrayDelegate.
 689   logout_confirmation_controller_.reset();
 690 #endif
 691
 692   // Destroy SystemTrayDelegate before destroying the status area(s).
 693   system_tray_delegate_->Shutdown();
 694   system_tray_delegate_.reset();
 695
 696   locale_notification_controller_.reset();
 697
 698   // Drag-and-drop must be canceled prior to close all windows.
 699   drag_drop_controller_.reset();
 700
 701   // Controllers who have WindowObserver added must be deleted
 702   // before |display_controller_| is deleted.
 703
 704 #if defined(OS_CHROMEOS)
 705   // VideoActivityNotifier must be deleted before |video_detector_| is
 706   // deleted because it's observing video activity through
 707   // VideoDetectorObserver interface.
 708   video_activity_notifier_.reset();
 709 #endif  // defined(OS_CHROMEOS)
 710   video_detector_.reset();
 711   high_contrast_controller_.reset();
 712
 713   shadow_controller_.reset();
 714   resize_shadow_controller_.reset();
 715
 716   window_selector_controller_.reset();
 717   mru_window_tracker_.reset();
 718
 719   // |shelf_window_watcher_| has a weak pointer to |shelf_Model_|
 720   // and has window observers.
 721   shelf_window_watcher_.reset();
 722
 723   // Destroy all child windows including widgets.
 724   display_controller_->CloseChildWindows();
 725   display_controller_->CloseNonDesktopDisplay();
 726
 727   // Chrome implementation of shelf delegate depends on FocusClient,
 728   // so must be deleted before |focus_client_|.
 729   shelf_delegate_.reset();
 730   focus_client_.reset();
 731
 732   // Destroy SystemTrayNotifier after destroying SystemTray as TrayItems
 733   // needs to remove observers from it.
 734   system_tray_notifier_.reset();
 735
 736   // These need a valid Shell instance to clean up properly, so explicitly
 737   // delete them before invalidating the instance.
 738   // Alphabetical. TODO(oshima): sort.
 739   magnification_controller_.reset();
 740   partial_magnification_controller_.reset();
 741   tooltip_controller_.reset();
 742   event_client_.reset();
 743   nested_dispatcher_controller_.reset();
 744   toplevel_window_event_handler_.reset();
 745   visibility_controller_.reset();
 746   // |shelf_item_delegate_manager_| observes |shelf_model_|. It must be
 747   // destroyed before |shelf_model_| is destroyed.
 748   shelf_item_delegate_manager_.reset();
 749   shelf_model_.reset();
 750
 751   power_button_controller_.reset();
 752   lock_state_controller_.reset();
 753
 754 #if defined(OS_CHROMEOS)
 755   resolution_notification_controller_.reset();
 756 #endif
 757   desktop_background_controller_.reset();
 758
 759   // This also deletes all RootWindows. Note that we invoke Shutdown() on
 760   // DisplayController before resetting |display_controller_|, since destruction
 761   // of its owned RootWindowControllers relies on the value.
 762   display_manager_->CreateScreenForShutdown();
 763   display_controller_->Shutdown();
 764   display_controller_.reset();
 765   screen_position_controller_.reset();
 766   accessibility_delegate_.reset();
 767   new_window_delegate_.reset();
 768   media_delegate_.reset();
 769
 770   keyboard::KeyboardController::ResetInstance(NULL);
 771
 772 #if defined(OS_CHROMEOS)
 773   if (display_change_observer_)
 774     display_configurator_->RemoveObserver(display_change_observer_.get());
 775   if (output_configurator_animation_)
 776     display_configurator_->RemoveObserver(output_configurator_animation_.get());
 777   if (display_error_observer_)
 778     display_configurator_->RemoveObserver(display_error_observer_.get());
 779   if (projecting_observer_)
 780     display_configurator_->RemoveObserver(projecting_observer_.get());
 781   display_change_observer_.reset();
 782 #endif  // defined(OS_CHROMEOS)
 783
 784 #if defined(OS_CHROMEOS)
 785   PowerStatus::Shutdown();
 786 #endif
 787
 788   DCHECK(instance_ == this);
 789   instance_ = NULL;
 790 }
 791
 792 void Shell::Init() {
 793   delegate_->PreInit();
 794   if (keyboard::IsKeyboardUsabilityExperimentEnabled()) {
 795     display_manager_->SetSecondDisplayMode(DisplayManager::VIRTUAL_KEYBOARD);
 796   }
 797   bool display_initialized = display_manager_->InitFromCommandLine();
 798 #if defined(OS_CHROMEOS)
 799   display_configurator_->Init(!gpu_support_->IsPanelFittingDisabled());
 800   output_configurator_animation_.reset(new OutputConfiguratorAnimation());
 801   display_configurator_->AddObserver(output_configurator_animation_.get());
 802
 803   projecting_observer_.reset(new ProjectingObserver());
 804   display_configurator_->AddObserver(projecting_observer_.get());
 805
 806   if (!display_initialized && base::SysInfo::IsRunningOnChromeOS()) {
 807     display_change_observer_.reset(new DisplayChangeObserver);
 808     // Register |display_change_observer_| first so that the rest of
 809     // observer gets invoked after the root windows are configured.
 810     display_configurator_->AddObserver(display_change_observer_.get());
 811     display_error_observer_.reset(new DisplayErrorObserver());
 812     display_configurator_->AddObserver(display_error_observer_.get());
 813     display_configurator_->set_state_controller(display_change_observer_.get());
 814     display_configurator_->set_mirroring_controller(display_manager_.get());
 815     display_configurator_->ForceInitialConfigure(
 816         delegate_->IsFirstRunAfterBoot() ? kChromeOsBootColor : 0);
 817     display_initialized = true;
 818   }
 819 #endif  // defined(OS_CHROMEOS)
 820   if (!display_initialized)
 821     display_manager_->InitDefaultDisplay();
 822
 823   // Install the custom factory first so that views::FocusManagers for Tray,
 824   // Shelf, and WallPaper could be created by the factory.
 825   views::FocusManagerFactory::Install(new AshFocusManagerFactory);
 826
 827   // Env creates the compositor. Historically it seems to have been implicitly
 828   // initialized first by the ActivationController, but now that FocusController
 829   // no longer does this we need to do it explicitly.
 830   aura::Env::CreateInstance();
 831
 832   // The WindowModalityController needs to be at the front of the input event
 833   // pretarget handler list to ensure that it processes input events when modal
 834   // windows are active.
 835   window_modality_controller_.reset(
 836       new ::wm::WindowModalityController(this));
 837
 838   AddPreTargetHandler(this);
 839
 840   env_filter_.reset(new ::wm::CompoundEventFilter);
 841   AddPreTargetHandler(env_filter_.get());
 842
 843   ::wm::FocusController* focus_controller =
 844       new ::wm::FocusController(new wm::AshFocusRules);
 845   focus_client_.reset(focus_controller);
 846   activation_client_ = focus_controller;
 847   activation_client_->AddObserver(this);
 848   focus_cycler_.reset(new FocusCycler());
 849
 850   screen_position_controller_.reset(new ScreenPositionController);
 851
 852   display_controller_->Start();
 853   display_controller_->CreatePrimaryHost();
 854   aura::Window* root_window = display_controller_->GetPrimaryRootWindow();
 855   target_root_window_ = root_window;
 856
 857 #if defined(OS_CHROMEOS)
 858   resolution_notification_controller_.reset(
 859       new ResolutionNotificationController);
 860 #endif
 861
 862   cursor_manager_.SetDisplay(GetScreen()->GetPrimaryDisplay());
 863
 864   nested_dispatcher_controller_.reset(new NestedDispatcherController);
 865   accelerator_controller_.reset(new AcceleratorController);
 866   maximize_mode_controller_.reset(new MaximizeModeController());
 867
 868 #if defined(OS_CHROMEOS) && defined(USE_X11)
 869   magnifier_key_scroll_handler_ = MagnifierKeyScroller::CreateHandler().Pass();
 870   AddPreTargetHandler(magnifier_key_scroll_handler_.get());
 871   speech_feedback_handler_ = SpokenFeedbackToggler::CreateHandler().Pass();
 872   AddPreTargetHandler(speech_feedback_handler_.get());
 873 #endif
 874
 875   // The order in which event filters are added is significant.
 876
 877 #if defined(OS_CHROMEOS)
 878   // The StickyKeysController also rewrites events and must be added
 879   // before observers, but after the EventRewriterEventFilter.
 880   sticky_keys_controller_.reset(new StickyKeysController);
 881   AddPreTargetHandler(sticky_keys_controller_.get());
 882 #endif
 883
 884   // wm::UserActivityDetector passes events to observers, so let them get
 885   // rewritten first.
 886   user_activity_detector_.reset(new ::wm::UserActivityDetector);
 887   AddPreTargetHandler(user_activity_detector_.get());
 888
 889   overlay_filter_.reset(new OverlayEventFilter);
 890   AddPreTargetHandler(overlay_filter_.get());
 891   AddShellObserver(overlay_filter_.get());
 892
 893   input_method_filter_.reset(new ::wm::InputMethodEventFilter(
 894       root_window->GetHost()->GetAcceleratedWidget()));
 895   AddPreTargetHandler(input_method_filter_.get());
 896
 897   accelerator_filter_.reset(new AcceleratorFilter);
 898   AddPreTargetHandler(accelerator_filter_.get());
 899
 900   event_transformation_handler_.reset(new EventTransformationHandler);
 901   AddPreTargetHandler(event_transformation_handler_.get());
 902
 903   toplevel_window_event_handler_.reset(new ToplevelWindowEventHandler);
 904
 905   system_gesture_filter_.reset(new SystemGestureEventFilter);
 906   AddPreTargetHandler(system_gesture_filter_.get());
 907
 908   keyboard_metrics_filter_.reset(new KeyboardUMAEventFilter);
 909   AddPreTargetHandler(keyboard_metrics_filter_.get());
 910
 911   // The keyboard system must be initialized before the RootWindowController is
 912   // created.
 913 #if defined(OS_CHROMEOS)
 914     keyboard::InitializeKeyboard();
 915 #endif
 916
 917   lock_state_controller_.reset(new LockStateController);
 918   power_button_controller_.reset(new PowerButtonController(
 919       lock_state_controller_.get()));
 920 #if defined(OS_CHROMEOS)
 921   // Pass the initial display state to PowerButtonController.
 922   power_button_controller_->OnDisplayModeChanged(
 923       display_configurator_->cached_displays());
 924 #endif
 925   AddShellObserver(lock_state_controller_.get());
 926
 927   drag_drop_controller_.reset(new DragDropController);
 928   mouse_cursor_filter_.reset(new MouseCursorEventFilter());
 929   PrependPreTargetHandler(mouse_cursor_filter_.get());
 930
 931   // Create Controllers that may need root window.
 932   // TODO(oshima): Move as many controllers before creating
 933   // RootWindowController as possible.
 934   visibility_controller_.reset(new AshVisibilityController);
 935
 936   magnification_controller_.reset(
 937       MagnificationController::CreateInstance());
 938   mru_window_tracker_.reset(new MruWindowTracker(activation_client_));
 939
 940   partial_magnification_controller_.reset(
 941       new PartialMagnificationController());
 942
 943   autoclick_controller_.reset(AutoclickController::CreateInstance());
 944
 945   high_contrast_controller_.reset(new HighContrastController);
 946   video_detector_.reset(new VideoDetector);
 947   window_selector_controller_.reset(new WindowSelectorController());
 948
 949   tooltip_controller_.reset(
 950       new views::corewm::TooltipController(
 951           scoped_ptr<views::corewm::Tooltip>(
 952               new views::corewm::TooltipAura(gfx::SCREEN_TYPE_ALTERNATE))));
 953   AddPreTargetHandler(tooltip_controller_.get());
 954
 955   event_client_.reset(new EventClientImpl);
 956
 957   // This controller needs to be set before SetupManagedWindowMode.
 958   desktop_background_controller_.reset(new DesktopBackgroundController());
 959   user_wallpaper_delegate_.reset(delegate_->CreateUserWallpaperDelegate());
 960
 961   session_state_delegate_.reset(delegate_->CreateSessionStateDelegate());
 962   accessibility_delegate_.reset(delegate_->CreateAccessibilityDelegate());
 963   new_window_delegate_.reset(delegate_->CreateNewWindowDelegate());
 964   media_delegate_.reset(delegate_->CreateMediaDelegate());
 965
 966   resize_shadow_controller_.reset(new ResizeShadowController());
 967   shadow_controller_.reset(
 968       new ::wm::ShadowController(activation_client_));
 969
 970   // Create system_tray_notifier_ before the delegate.
 971   system_tray_notifier_.reset(new ash::SystemTrayNotifier());
 972
 973   // Initialize system_tray_delegate_ before initializing StatusAreaWidget.
 974   system_tray_delegate_.reset(delegate()->CreateSystemTrayDelegate());
 975   DCHECK(system_tray_delegate_.get());
 976
 977   locale_notification_controller_.reset(new LocaleNotificationController);
 978
 979   // Initialize system_tray_delegate_ after StatusAreaWidget is created.
 980   system_tray_delegate_->Initialize();
 981
 982 #if defined(OS_CHROMEOS)
 983   // Create the LogoutConfirmationController after the SystemTrayDelegate.
 984   logout_confirmation_controller_.reset(new LogoutConfirmationController(
 985       base::Bind(&SystemTrayDelegate::SignOut,
 986                  base::Unretained(system_tray_delegate_.get()))));
 987 #endif
 988
 989   display_controller_->InitDisplays();
 990
 991   // It needs to be created after RootWindowController has been created
 992   // (which calls OnWindowResized has been called, otherwise the
 993   // widget will not paint when restoring after a browser crash.  Also it needs
 994   // to be created after InitSecondaryDisplays() to initialize the wallpapers in
 995   // the correct size.
 996   user_wallpaper_delegate_->InitializeWallpaper();
 997
 998   if (initially_hide_cursor_)
 999     cursor_manager_.HideCursor();
1000   cursor_manager_.SetCursor(ui::kCursorPointer);
1001
1002 #if defined(OS_CHROMEOS)
1003   // Set accelerator controller delegates.
1004   accelerator_controller_->SetBrightnessControlDelegate(
1005       scoped_ptr<ash::BrightnessControlDelegate>(
1006           new ash::system::BrightnessControllerChromeos).Pass());
1007
1008   power_event_observer_.reset(new PowerEventObserver());
1009   user_activity_notifier_.reset(
1010       new ui::UserActivityPowerManagerNotifier(user_activity_detector_.get()));
1011   video_activity_notifier_.reset(
1012       new VideoActivityNotifier(video_detector_.get()));
1013   bluetooth_notification_controller_.reset(new BluetoothNotificationController);
1014   last_window_closed_logout_reminder_.reset(new LastWindowClosedLogoutReminder);
1015 #endif
1016
1017   weak_display_manager_factory_.reset(
1018       new base::WeakPtrFactory<DisplayManager>(display_manager_.get()));
1019   // The compositor thread and main message loop have to be running in
1020   // order to create mirror window. Run it after the main message loop
1021   // is started.
1022   base::MessageLoopForUI::current()->PostTask(
1023       FROM_HERE,
1024       base::Bind(&DisplayManager::CreateMirrorWindowIfAny,
1025                  weak_display_manager_factory_->GetWeakPtr()));
1026 }
1027
1028 void Shell::InitKeyboard() {
1029   if (keyboard::IsKeyboardEnabled()) {
1030     if (keyboard::KeyboardController::GetInstance()) {
1031       RootWindowControllerList controllers = GetAllRootWindowControllers();
1032       for (RootWindowControllerList::iterator iter = controllers.begin();
1033            iter != controllers.end(); ++iter) {
1034         (*iter)->DeactivateKeyboard(
1035             keyboard::KeyboardController::GetInstance());
1036       }
1037     }
1038     keyboard::KeyboardControllerProxy* proxy =
1039         delegate_->CreateKeyboardControllerProxy();
1040     keyboard::KeyboardController::ResetInstance(
1041         new keyboard::KeyboardController(proxy));
1042   }
1043 }
1044
1045 void Shell::InitRootWindow(aura::Window* root_window) {
1046   DCHECK(activation_client_);
1047   DCHECK(visibility_controller_.get());
1048   DCHECK(drag_drop_controller_.get());
1049
1050   aura::client::SetFocusClient(root_window, focus_client_.get());
1051   input_method_filter_->SetInputMethodPropertyInRootWindow(root_window);
1052   aura::client::SetActivationClient(root_window, activation_client_);
1053   ::wm::FocusController* focus_controller =
1054       static_cast< ::wm::FocusController*>(activation_client_);
1055   root_window->AddPreTargetHandler(focus_controller);
1056   aura::client::SetVisibilityClient(root_window, visibility_controller_.get());
1057   aura::client::SetDragDropClient(root_window, drag_drop_controller_.get());
1058   aura::client::SetScreenPositionClient(root_window,
1059                                         screen_position_controller_.get());
1060   aura::client::SetCursorClient(root_window, &cursor_manager_);
1061   aura::client::SetTooltipClient(root_window, tooltip_controller_.get());
1062   aura::client::SetEventClient(root_window, event_client_.get());
1063
1064   aura::client::SetWindowMoveClient(root_window,
1065       toplevel_window_event_handler_.get());
1066   root_window->AddPreTargetHandler(toplevel_window_event_handler_.get());
1067   root_window->AddPostTargetHandler(toplevel_window_event_handler_.get());
1068
1069   if (nested_dispatcher_controller_) {
1070     aura::client::SetDispatcherClient(root_window,
1071                                       nested_dispatcher_controller_.get());
1072   }
1073 }
1074
1075 bool Shell::CanWindowReceiveEvents(aura::Window* window) {
1076   RootWindowControllerList controllers = GetAllRootWindowControllers();
1077   for (RootWindowControllerList::iterator iter = controllers.begin();
1078        iter != controllers.end(); ++iter) {
1079     SystemModalContainerLayoutManager* layout_manager =
1080         (*iter)->GetSystemModalLayoutManager(window);
1081     if (layout_manager && layout_manager->CanWindowReceiveEvents(window))
1082       return true;
1083     // Allow events to fall through to the virtual keyboard even if displaying
1084     // a system modal dialog.
1085     if ((*iter)->IsVirtualKeyboardWindow(window))
1086       return true;
1087   }
1088
1089   return false;
1090 }
1091
1092 ////////////////////////////////////////////////////////////////////////////////
1093 // Shell, ui::EventTarget overrides:
1094
1095 bool Shell::CanAcceptEvent(const ui::Event& event) {
1096   return true;
1097 }
1098
1099 ui::EventTarget* Shell::GetParentTarget() {
1100   return aura::Env::GetInstance();
1101 }
1102
1103 scoped_ptr<ui::EventTargetIterator> Shell::GetChildIterator() const {
1104   return scoped_ptr<ui::EventTargetIterator>();
1105 }
1106
1107 ui::EventTargeter* Shell::GetEventTargeter() {
1108   NOTREACHED();
1109   return NULL;
1110 }
1111
1112 void Shell::OnEvent(ui::Event* event) {
1113 }
1114
1115 ////////////////////////////////////////////////////////////////////////////////
1116 // Shell, aura::client::ActivationChangeObserver implementation:
1117
1118 void Shell::OnWindowActivated(aura::Window* gained_active,
1119                               aura::Window* lost_active) {
1120   if (gained_active)
1121     target_root_window_ = gained_active->GetRootWindow();
1122 }
1123
1124 }  // namespace ash